Samuel c



(mmdel') s. @.LAPPBRTY.

TBRMINALPLUG ATTAGHMBNT P0P. FLEXIBLE ELECTRIG comas. No. 411.153.Patented Sept. 17, 1889.

N. PETERS, Pham-Lithography, wumngmn. D. c.

UNITED STATES PATENT OFFICE.

SAMUEL C. LAFFERTY, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE VESTERNELECTRIC COMPANY, OF SAME PLACE.

TERMINAL PLUG ATTACHMENT FOR FLEXIBLE ELECTRIC CORDS.

SPECIFIGATIQN forming part of Letters Patent No. 411,153, datedseptember 17, 188e.

V Application led September 5, 1887. Serial No.248,818. (No model.)

To @ZZ whom it may concern:

Be it known that I, SAMUEL C. LAEEERTY, a citizen of the United States,residing at Chicago, in the countjv of Cook and State of Illinois, haveinvented a certain new and useful Improvementin Terminal PlugAttachments `for Flexible Electric Cords, of which the following is afull, clear, concise, and exact description, reference being had to theaccompanying drawings, forming a part of this specication.

My invention relates to iiexible cords and plugs designed for making theconnection upon electric switch-boards, and more especially to theconnection of the cord with the plug.

My invention is illustrated in the accompanying drawings, in which-Figure l is a sectional view of a cord and its terminal plug attachedtogether in accordance with my invention. Fig. 2 shows the plug with therubber handle removed, the clamps being separated to admit the end ofthe spirally-wound flexible conducting-wire.

Like parts are indicated by similar letters of reference in thedifferent gures.

The clamp consists of the pieces a and b, attached to the rear end ofthe metallic stem of the plugA by the pin or pivot c. Handle d isprovided on the outside with rubber e, the inner portion being metal,preferably brass, which is tapped out to correspond to the thread f,provided on the stein of the plug. The plug-handle beyond the femalethreadis bored out, so that the opening will be slightly 3 5tapering,thusncorresponding to the shape of thepivot'ed piecesbr jaws ab when closed over the cord, as shown in Fig. l. In order to attach thecord to the plug the handle d is slipped over the cord, and the tip ofthe 4o cord is then placed between the jaws, s o that the insulatingcovering will come between the jaws. The handle is then placed over thejaws and screwed down over the thread f. Owing to the shape of the jawsand that 45 of the bore of the handle, the jaws are inade to firmlyclasp the core and hold at the same time the covering of the cord whenthe handle is lin place, as shown in Fig. 1. Plugs may thus be readilyconnected and disconnected 5c from their cords as occasion may require.

I therefore do not limit my invention to the precise construction shown,but claim, broadly- The combination, with the projecting core 55 of anelectric cord and the insulating covering thereof, of the claspconsisting of two jaws pivoted to the stein of the plug and pressedfirmly against the said core and covering by the handle placed over thesaid jaws 6o and screwed upon the thread provided on the stem,substantially as shown and described.

In witness whereof I hereunto subscribe my name this 15th day of July,A. D. 1887.

SAMUEL C. LAFFERTY.

Witnesses:

GEORGE P. BARTON, WM. M. GILLER.

